Hello, GHC 7.2.x or higher provides getNumCapabilities function, and numCapabilities is implemented by unsafePerformIO + getNumCapabilities.
http://www.haskell.org/ghc/docs/7.2.2/html/libraries/base-4.4.1.0/GHC-Conc.html#v:numCapabilities http://www.haskell.org/ghc/docs/7.2.2/html/libraries/base-4.4.1.0/src/GHC-Conc-Sync.html#numCapabilities I think to use getNumCapabilities is better than to use numCapabilities in DPH now. Best Regards, -- shelarcy <shelarcy hotmail.co.jp> http://page.freett.com/shelarcy/
0001-dph-prim-par-use-getNumCapabilities-instead-of-numCa.patch
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